Dynamical apparent horizons in inhomogeneous Brans-Dicke universes
Physical Review D - Particles, Fields, Gravitation and Cosmology, ISSN: 1550-7998, Vol: 86, Issue: 6
2012
- 18Citations
- 5Captures
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Article Description
The presence and evolution of apparent horizons in a two-parameter family of spherically symmetric, time-dependent solutions of Brans-Dicke gravity are analyzed. These solutions were introduced to model space- and time-varying gravitational couplings and are supposed to represent central objects embedded in a spatially flat universe. We find that the solutions possess multiple evolving apparent horizons, both black hole horizons covering a central singularity and cosmological ones. It is not uncommon for two of these horizons to merge, leaving behind a naked singularity covered only by a cosmological horizon. Two characteristic limits are also explicitly worked out: the limit where the theory reduces to general relativity and the limit where the solutions become static. The physical relevance of this family of solutions is discussed. © 2012 American Physical Society.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84867016817&origin=inward; http://dx.doi.org/10.1103/physrevd.86.064040; https://link.aps.org/doi/10.1103/PhysRevD.86.064040; http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.86.064040/fulltext; http://link.aps.org/article/10.1103/PhysRevD.86.064040
American Physical Society (APS)
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